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Abstract

Blinded prospective evaluation of sensitivity of MR angiography to known intracranial aneurysms: importance of aneurysm size.

J Huston, D A Nichols, P H Luetmer, J T Goodwin, F B Meyer, D O Wiebers and A L Weaver
American Journal of Neuroradiology October 1994, 15 (9) 1607-1614;
J Huston
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905.
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D A Nichols
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905.
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P H Luetmer
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905.
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J T Goodwin
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905.
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F B Meyer
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905.
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D O Wiebers
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905.
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A L Weaver
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minn. 55905.
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Abstract

PURPOSE To determine the sensitivity of time-of-flight and phase-contrast MR angiography for the detection of intracranial aneurysms.

METHODS Sixteen patients with 27 intracranial aneurysms previously identified with conventional angiography and 19 control patients were examined with three-dimensional time-of-flight, three-dimensional phase-contrast MR angiography, and standard MR imaging. Subvolumes of the carotid and posterior circulations, source images, and standard MR images were blindly interpreted by three experienced neuroradiologists.

RESULTS Detection of an aneurysm by a given sequence was defined as at least two of the three blinded readers identifying the aneurysm. The sensitivities of the sequences based on all 27 aneurysms were: transaxial T1, 25.9%; T2, 48.1%; PC, 44.4%; and TF, 55.6%. Two of 3 aneurysms detected with T2 but not MR angiography had adjacent blood products. Five millimeters appeared to be a critical size; the sensitivities for aneurysms greater than or equal to 5 mm were: T1, 37.5%; T2, 62.5%; PC, 75%; and TF, 87.5%.

CONCLUSIONS Three-dimensional time-of-flight MR with 512 x 256 matrix is more sensitive than three-dimensional phase-contrast or standard MR imaging for detection of aneurysms. Retrospectively, aneurysms 3 mm or larger can be identified with MR angiography; however, prospectively, 5 mm is the critical size for detection.

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American Journal of Neuroradiology
Vol. 15, Issue 9
1 Oct 1994
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Blinded prospective evaluation of sensitivity of MR angiography to known intracranial aneurysms: importance of aneurysm size.
J Huston, D A Nichols, P H Luetmer, J T Goodwin, F B Meyer, D O Wiebers, A L Weaver
American Journal of Neuroradiology Oct 1994, 15 (9) 1607-1614;

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Blinded prospective evaluation of sensitivity of MR angiography to known intracranial aneurysms: importance of aneurysm size.
J Huston, D A Nichols, P H Luetmer, J T Goodwin, F B Meyer, D O Wiebers, A L Weaver
American Journal of Neuroradiology Oct 1994, 15 (9) 1607-1614;
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